The invention discloses a technique and a method for preparing celery, carrot and tomato vegetable and fruit juice. The method comprises the following steps of: performing a series of processing on celery, carrots and tomatoes to prepare celery juice, carrot juice and tomato juice; and preparing into the celery, carrot and tomato vegetable and fruit juice according to a certain ratio. The juice contains rich proteins, carbohydrates, saccharides, organic acids, cellulose, quercetin, kaempferol, dietary fibers, thiamine, riboflavin, nicotinic acid, calcium, magnesium, iron, copper, phosphorus, potassium, sodium, iodine, zinc, selenium, manganese and the like, carotene, vitamins A, C, B1, B2 and the like, and has health effects of removing phlegm, promoting urination and discharging sodium, improving appetite and promoting digestion, producing saliva and slaking thirst, relaxing bowel, clearing heat and releasing toxin, reducing blood fat and blood pressure, resisting blood coagulation, preventing cerebral thrombosis, clearing liver and improving vision, beautifying, removing free radicals in a body, enhancing immunity of organisms, preventing and resisting cancers, deferring senility, promoting intelligence and building body, keeping healthy, and preventing and treating diseases if the juice is drunk frequently.